3 or 4 double shots in the morning. Drip and (especially perc) coffee delivers more caffeine, mostly due to volume. I've knocked myself into jitters with drip on numerous occasions. Never done this with espresso.
You're fine. I've had baristas balk at a quad shot right after serving someone a 16oz. drip without even blinking. There's probably as much if not more caffeine in the 16oz. drip.